DOC.
28
177
Doc. 28
Review
of
G.
MESLIN,
"On
the Constant in Mariotte
and Gay-Lussac's
Law"
("Sur
la
constante
de
la loi
de
Mariotte
et
Gay-Lussac,"
Journal
de
physique theorique
et appliquee 4
(Series
4)
(1905): 252-256)
[Beiblätter
zu
den
Annalen
der
Physik 29 (1905):
1114]
It is
shown
that the quotient
of the
above constant
and the
mechanical [1]
equivalent of
heat,
which has
a
value
slightly
different
from 2,
is inde-
pendent
of the choice of the units for
mass,
length, and
time, but that
nevertheless
no
physical
meaning
is
to
be
ascribed
to
the numerical value
of
this quotient because it
depends
on
the choice
of
the unit of molecular
weight.
[2]
Doc. 29
Review
of
A. FLIEGNER,
"The
Efflux of
Hot
Water from
Container Orifices"
("Das
Ausströmen
heissen
Wassers
aus Gefässmündungen,"
Schweizerische
Bauzeitung 45
(1905):
282-285, 306-308)
[Beiblätter
zu
den
Annalen
der
Physik 29 (1905):
1115]
According
to
Zeuner and
Lorenz, the deviation of Pulin
and
Bonnin's
[1]
experimental
results
concerning
the efflux
velocity
of
water
under the
[2]
pressure
of its
steam
is
to be
ascribed
to
a
sort of
evaporation delay.
In
contrast,
the author takes the
point of view that the lack
of
agreement
between
the
experiments
and
the
theory
is
to
be
ascribed
to
the fact that in
the above-mentioned
experiments, due to temperature
differences within the
water
container,
the
water
reaching
the
point
of
outflow
has
a
somewhat
lower
temperature
than that
corresponding
to
the
vapor pressure
in
the container.
In
addition,
an
experiment
is
cited
in
which
the
above
source
of
error was
avoided
and
in
which
the result
was
in
agreement
with the
theory.